Rare earth elements have the advantages of long fluorescence lifetime,large Stokes shift and sharp characteristic emission,but the ultraviolet absorption coefficient is very low.The introduction of Schiff base ligand can better absorb energy-sensitized rare earth ion emission,in which antenna effect is an important sensing mechanism.In addition,there are four main mechanisms for the detection of various small molecules or ions by rare earth complexes as fluorescent probes.In this paper,these five sensing mechanisms were introduced to explore the reasons for fluorescence quenching or enhancement.
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